Handling: hand and hoist-line implements – Hook – hoistline – or grab type – Cable and hook tackle
Patent
1994-02-28
1997-01-28
Kramer, Dean
Handling: hand and hoist-line implements
Hook, hoistline, or grab type
Cable and hook tackle
294 8224, 294 74, B66C 114
Patent
active
055971911
ABSTRACT:
A choker hook is connected to a choker cable and is used for pulling a log from its felled position to a desired location. The choker hook is remotely released from the log without manual intervention at the desired end position. The choker hook has a configuration where a ferrule on the end of the choker cable tends to nest within the choker hook and assume a locking position when the log is being transported. When the direction of pull in the cable is reversed, the forces will tend to remove the ferrule from its locking position and release it from the choker hook thereby releasing the log. During the force reversal, the choker hook rotates about a predetermined angle and about predetermined axes of rotation depending on its specific configuration.
REFERENCES:
patent: 1720069 (1929-07-01), Yeaton
patent: 2872716 (1959-02-01), Ehmann et al.
patent: 3239900 (1966-03-01), Bottoms
patent: 3323185 (1967-06-01), Maras
patent: 3409950 (1968-11-01), Boyd
patent: 3633960 (1972-01-01), Drayton
patent: 4709952 (1987-12-01), Selby
patent: 4762356 (1988-08-01), Robins
patent: 5064235 (1991-11-01), Lessard
Article entitled "Yarding made easy", by Scott Jamieson, published in the Jul./Aug. 1993 issue of Canadian Forest Industries.
Article entitled "Spreading The Word", by Scott Jamieson, published in the Jul./Aug. 1993 issue of Canadian Forest Industries.
Article entitled "Risley Slingshot, Best of both worlds", by Scott Jamieson, published in the Jun. 1993 issue of Canadian Forest Industries.
Undated publication regarding "Chokers for automatic unhooking", pp. 215-222.
Ewart James M.
McPhee J. Brent
Forest Engineering Research Institute of Canada
Kramer Dean
Russell Uren John
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